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We try to set the scaling governor for all CPU cores, but
this doesn't work SOCs that dynamically disable cores
entirely (ie. Qualcomm). Since this only happens on Qcomm,
this patch stops the 'mpdecision' process on Qualcomm, which
makes it behave like other devices.

PERF-SHERIFFS: This may improve metrics for the better given
all cores are in 'performance' mode now. It should hopefully
reduce noise, since a different number of cores might have
had 'performance' set on each run, and any code that runs on
a non-performance core will suffer from noisy timings/rates.

Example: Tough-compositor-cases std-dev went from 0.25ms to
0.04ms with this change.

BUG=383566

Review URL: https://codereview.chromium.org/338233003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278837 0039d316-1c4b-4281-b951-d872f2087c98